Layer – Feeds sheets of glass onto conveyor type, plaster-covered table that carries sheets into grinding machine: Climbs onto table and receives glass from workers on floor. Lowers ends simultaneously onto table to avoid cracking sheet. Positions sheets end to end so that edges will not be chipped or glass cracked as glass passes beneath grinding heads. Raises glass and scoops more plaster under edges to level sheets. Pulls roller over glass sheets to settle them in and remove air bubbles from plaster.